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Message: <blockquote data-quote="iserith" data-source="post: 9063789" data-attributes="member: 97077">The rules lay out a couple of basic options in the PHB for failed ability checks - no progress toward the objective or progress combined with a setback. So I think it's fair for the DM to say upon seeing the failed check that the PC has noticed a tell that the NPC is lying (progress), but the NPC also notices they gave something away (setback). Now the NPC's attitude may shift in the wrong direction, hampering the PCs from getting what they want. They may break off the interaction or perhaps just become more cagey, making it more difficult or impossible to suss out what they're lying about, their agenda, ideal, bond, flaw, or next move.</blockquote>